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Nonetheless, it is still the case that if you have a large number of commuters moving from points A to B (or points A, B and C to D), half of a double track will move as many as a multilane expressway without the wasted space, pollution, and much higher accident rate. A luxury? A hobby? It is true that in the USA heavy-rail commuter tends to work as a subsidy more toward the middle class than the poor, but that's because most such commutation still heads to a fixed point--the inner city--and is more efficient that way than the spread-out driving habits of the working poor. That, too, is changing, though--compare a fixed-downtown system like Chicago's Metra to the more linear, on-and-off boardings in many of the California systems. These benefit everyone.
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